fix: correct Docker setup, SDK async API, and docs

- Dockerfile: use explicit uvicorn command (uv run start fails without package mode)
- docker-compose: mount claude-auth volume to /root/.claude (worker runs as root)
- worker: update to Claude Code SDK async iterable API (query() returns iterator, not array)
- main.py: fix docs_url from /doc to /docs
- README: correct login instructions (exec not run --rm), add production URLs
- Add CLAUDE.md with full project documentation

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -33,7 +33,7 @@ services:
     env_file: .env
     volumes:
       - opus-data:/data
-      - claude-auth:/home/node/.claude
+      - claude-auth:/root/.claude
     restart: unless-stopped
     healthcheck:
       test: ["CMD", "wget", "--spider", "-q", "http://localhost:3001/health"]